This page presents a long range weather forecast for Ontario in May as well as other months. You can quickly get a brief overview of the weather to expect in May on a daily basis.
The Ontario extended forecast data provided is based on the average values of previous years.
Long range weather forecast
Select a month and click on a day for more information:
Wednesday
May 1
25° / 11°
Thursday
May 2
23° / 11°
Friday
May 3
24° / 11°
Saturday
May 4
23° / 12°
Sunday
May 5
19° / 11°
Monday
May 6
24° / 10°
Tuesday
May 7
24° / 12°
Wednesday
May 8
26° / 13°
Thursday
May 9
25° / 14°
Friday
May 10
25° / 14°
Saturday
May 11
25° / 14°
Sunday
May 12
26° / 14°
Monday
May 13
25° / 15°
Tuesday
May 14
24° / 15°
Wednesday
May 15
24° / 14°
Thursday
May 16
24° / 14°
Friday
May 17
22° / 14°
Saturday
May 18
27° / 13°
Sunday
May 19
28° / 15°
Monday
May 20
26° / 14°
Tuesday
May 21
26° / 12°
Wednesday
May 22
26° / 12°
Thursday
May 23
28° / 12°
Friday
May 24
28° / 14°
Saturday
May 25
28° / 13°
Sunday
May 26
27° / 14°
Monday
May 27
25° / 12°
Tuesday
May 28
27° / 13°
Wednesday
May 29
26° / 14°
Thursday
May 30
26° / 13°
Friday
May 31
26° / 14°
Ontario 30 days weather forecast
Check out our estimated 30 days weather forecast for Ontario, this data is based on the average weather in Ontario in the last few years.
For a more accurate and detailed forecast, check out the 14 day weather for Ontario next to the desired date.